Kinetic Description of the Leaching Mining Process for Carnallite

Volume 2, Issue 1, February 2017     |     PP. 7-20      |     PDF (628 K)    |     Pub. Date: March 14, 2017
DOI:    353 Downloads     8054 Views  

Author(s)

Yan-Fang MA, Xi'an University of Science and Technology, Xi'an 710054, PR China; Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, PR China
Kan-She LI, Xi'an University of Science and Technology, Xi'an 710054, PR China
Zhi-Hong ZHANG, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, PR China
Tian-Qi HU, University of Chinese Academy of Sciences, Beijing 100049, PR China
Jian-Kang WANG, University of Chinese Academy of Sciences, Beijing 100049, PR China

Abstract
Underground leaching mining of carnallite is a mining method with minimal environmental impact. This method involves the leaching of potassium ions from solid carnallite into a liquid phase and subsequent recovery. Herein, we describe research on the effect of temperature on the process of carnallite dissolution, which is a key factor that affects its underground mining. The kinetics of the carnallite dissolution process has been studied, and dissolution kinetic models have been established under isothermal and non-isothermal conditions. The carnallite dissolution process conforms to the Stumm model at 298.15, 323.15 and 348.15K. The dissolution kinetics can be expressed as (0.0083T-2.511)Aexp(-E/RT)t=-1/1.4799 (2.23-c)^1.4799 under non-isothermal conditions. The concentration of potassium ions in the process of leaching mining can thereby be predicted. This model may provide guidance for more effective underground leaching mining of carnallite.

Keywords
Carnallite; underground leaching mining; non-isothermal; kinetics

Cite this paper
Yan-Fang MA, Kan-She LI, Zhi-Hong ZHANG, Tian-Qi HU, Jian-Kang WANG, Kinetic Description of the Leaching Mining Process for Carnallite , SCIREA Journal of Chemistry. Volume 2, Issue 1, February 2017 | PP. 7-20.

References

[ 1 ] Bao Ji-qing, Xia Shu-ping, 1995, Study on the Dissolution and Transformation of Carnallite in Na2SO4 Solution, Journal of Salt Lake Science, 3(3), 40-47.
[ 2 ] Wang Ben, 1997, Accelerate the development of underground leaching mining technology in China, China Mining Magazine C, 34(6), 8-11.
[ 3 ] Liang Wei-guo, Zhao Yang-sheng, Xu Su-guo, Yu Yan-mei, 2012, Theoretical Study of in-situ Solution Mining, Journal of Taiyuan University of Technology, 43(3), 382-387.
[ 4 ] Xia Shu-Ping, Hong Xian-lan, 1993, A Study on the Dissolution Kinetics and Mechanism of Carnallite and KCl, Journal of Salt Lake Science, 1(4), 52-60.
[ 5 ] Hong Xian-lan, Xia Shu-Ping, Gao Shi-yang, 1994, Dissolution Kinetics of Carnallite, Chinese Journal of Applied Chemistry, 11(3), 26-31.
[ 6 ] Xia Shu-ping, Hong Xian-lan, Gao Shi-yang, 1993, Study of the principle of carnallite decomposition of potassium chloride process, Journal of Salt and Chemical Industry, 23(2), 10-15.
[ 7 ] S. Vyazovkin, 1995, The Application of Isoconversional Methods for Analyzing Isokinetic Relationships Occurring at Thermal Decomposition of Solids. Journal of Solid State Chemistry, 114, 392-398.
[ 8 ] M.E. Brown, M. Maciejewski, S. Vyazovkin, R. Nomen, J. Sempere, A. Burnham, J. Opfermann, R. Strey, H.L. Anderson, A. Kemmler, R. Keuleers, J. Janssens, H.O. Desseyn, Chao-Rui Li, Tong B. Tang, B. Roduit, J. Malek, T. Mitsuhashi, 2000, Computational aspects of kinetic analysis, Thermochimica Acta, 355, 125-143.
[ 9 ] Cheng Huai-de,Ma Hai-zhou,Zhang Zhi-hong,2013,Preliminary study on effect of high-magnesium solution on carnallite decomposition, Inorganic Chemicals Industry, 45(1), 21-23.
[ 10 ] Huaide Cheng, Haizhou Ma,Qingyu Hai,Zhihong Zhang,Liming Xu,Guangfen Ran,2015, Model for the decomposition of carnallite in aqueous solution, International Journal of Mineral Processing, 139, 36–42.
[ 11 ] Qinghai Institute of Salt Lakes, Chinese of Academy of Sciences, 1988, The analysis method of the brine and salt [M], Beijing: Science Press.
[ 12 ] Ni Zhi-yao, 1998, Reaction Kinetics Analysis for Mineral Dissolution and Crystallization, Geology-Geochemistry, 26(2), 39-44.
[ 13 ] Sergey Vyazovkin, Wolfgang Linert, 1995, Detecting isokinetic relationships in non-isothermal systems by the isoconversional method, Thermochimica Acta 269/270, 61-72.
[ 14 ] Cheng Yi, 2006, A New Kinetic Equation for Non-Isothermal Reaction Process, Chinese Journal of Inorganic Chemistry 22(2), 287-292.
[ 15 ] Bao Ji-qing, Xia Shu-ping, 1995, Study on effect of NaCl on dissolution of carnallite, Journal of Salt Lake Science, 3(2), 51-58.
[ 16 ] Sergey Vyazovkin, Wolfgang Linert, 1995, False isokinetic relationships found in the non-isothermal decomposition of solids, Chemical Physics 193, 109-118.
[ 17 ] Zhang Kai-yong, Tang Na, Lian Ying, 2009, Story on the Decomposition Liquid Concentration Characteristics in the Crystallizer of Potassium Chloride Production by Carnallite Cold-decomposition Method, Journal of Salt and Chemical Industry, 39(1), 3-6.
[ 18 ] Zhang Kai-yong, 2010, Story on the Decomposition Liquid Concentration Characteristics and Dynamics in Carnallite Cold-decomposition Process”, master's degree thesis of Tianjin University of Science and Technology.
[ 19 ] Zhu Jian-rong, Xiao Xueying, Zhang Zhihong, Dong Shengfa, Ma Yanfang, Zhang Yongfeng, Du Jianning, 2012, Study on carnallite decomposition of Kunteyi Salt Lake through analysis of components in liquid phase, Inorganic Chemicals Industry, 44(1), 37-39.
[ 20 ] Vyazovkin S, Wight C. A. 1999, Thermochim. Acta, 341, 53-68.